body {
    margin: 0;
    padding: 0;
    width: 100vw;
    height: 100vh;
    overflow: hidden;
    transition: all 0.4s ease-out;
}

.wrapper {
    margin: 20px auto;
    padding: 20px;

    &.wrapper1 {
        background-color: #27ae60;
    }

    &.wrapper2 {
        background-color: #95a5a6;
    }
}